A simple Google search turned up a solution which seems to match exactly
what you want to do:
https://github.com/angular/angular/issues/4112

On Thu, Jun 30, 2016, 06:56 Simon Azzopardi <[email protected]>
wrote:

> Another Service is calling that method:
>>
>>
> import { Injectable }             from '@angular/core';
> import { CanActivate,
>          Router,
>          ActivatedRouteSnapshot,
>          RouterStateSnapshot }    from '@angular/router';
> import { AuthService }            from './auth.service';
>
> import { LoginResponseModel } from './Login/loginResponseModel';
>
> @Injectable()
> export class AuthGuard implements CanActivate{
>
>     constructor(private _authService: AuthService, private _router:
> Router) {}
>
>     canActivate(
>
>          next:  ActivatedRouteSnapshot,
>         state: RouterStateSnapshot
>
>     ){
>
>         if(this._authService.subscribeIsUserLoggedIn()){
>             return true;
>         }else{
>             this._router.navigate(['/login']);
>             return false;
>         }
>     }
> }
>
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